Multilingual forums do work, as long as people respect that a thread started in English stays in English. Even if you would go with the Scandinavian alternative, you'd need to accommodate English anyway, since Finnish makes absolutely no sense at all, whatsoever.
Generally, I think it's a good idea that could potentially breathe some life into the Scandinavian/Nordic user community, but it would need its own forum, as opposed to being a subforum to one of the already existing local ones.
Linuxfest Copenhagen 2007, anyone?
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